I've had my CDS dial move without my knowledge several times.
Once while posting up on a saddle for elk for an evening hunt I checked it and was exactly 180` out. Didn't know which way to turn it back. Had to pull out the bolt and do the poor man's boresight trick to figure it out. Could have resulted in a missed or wounded elk.
I prefer locking style turrets now, like the Weaver Super Slam and Zeiss Conquest HD5.
